Definition of foramen magnum in English:

foramen magnum

noun

Anatomy
  • The hole in the base of the skull through which the spinal cord passes.

    • ‘A malformed brain stem was attached to the foramen magnum.’
    • ‘The root lies dorsal to the rootlets of the 1st cervical nerve and the vertebral artery and can be followed through the foramen magnum into the cranial cavity.’
    • ‘At the level of the foramen magnum, where the spinal cord ends and the medulla oblongata begins, the gray matter undergoes a marked reorganization.’
    • ‘Located at the base of the skull, the medulla oblongata is continuous with the spinal cord at the foramen magnum.’
    • ‘The cysts may localize anywhere within the CNS, but are often found at the base of the brain around the foramen magnum or surrounding the spinal cord.’

Origin

Late 19th century: Latin, large opening.